In my opinion a bedroom should be serene and peaceful without too much clutter and bold colors. Here are some examples of bedroom that I personally like. Furniture and accessories made from natural materials such as wood, cotton, wool and linen are great to achieve a similar look.
(images from 1. Raul Candales, 2. Dreamy Whites, 3. houzz.com / via French by Design, 4. Mari Eriksson for Skona Hem)